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From "Josh Elser (JIRA)" <>
Subject [jira] [Commented] (ACCUMULO-3648) Ability to Scan Table Keys in Reverse Order
Date Thu, 05 Mar 2015 23:01:38 GMT


Josh Elser commented on ACCUMULO-3648:

This would be a very nice new feature to Accumulo. We could do it on the server at a few different
levels, but I would imagine the closer we could do it to the file-level (as opposed to a Scan
or Iterator), the more efficient we could make it.

For context from HBase when they implemented a reverse scanner: HBASE-4811

> Ability to Scan Table Keys in Reverse Order
> -------------------------------------------
>                 Key: ACCUMULO-3648
>                 URL:
>             Project: Accumulo
>          Issue Type: New Feature
>          Components: master, tserver
>            Reporter: Mike Fagan
>              Labels: features, performance
> There are cases where you would like to scan a table in reverse key order.
> For example: 
> Consider a table using an inverted timestamp key.
> This allows for very quick access to the latest records.
> But  It would be helpful to quickly access earliest records without having to:
> A) scan through all the records to build a collection to reverse sort
> B) store the table again using the reverse key

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